A 2.10 kg snowball is fired from a cliff 11.0 m high. The snowball\'s initial ve

Question

A 2.10 kg snowball is fired from a cliff 11.0 m high. The snowball's initial velocity is 10.1 m/s, directed 27.0degree above the horizontal, (a) How much work is done on the snowball by the gravitational force during its flight to the flat ground below the cliff? (b) What is the change in the gravitational potential energy of the snowball-Earth system during the flight? (c) If that gravitational potential energy is taken to be zero at the height of the cliff, what is its value when the snowball reaches the ground? Number Units Number Units Number Units

Explanation / Answer

a) Work done by gravitational force = m g h = 2.10 x9.8 x 11 = 226.38 J

b) change in PE = - W = - 226.28 J

c) PE at ground - PE at cliff = change in PE = - 226.28

PEg - 0 = -226.28

PEg = - 226.28 J

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